Although not always reliable, lie detectors, or polygraph machines, have been used to uncover lies for generations; they represent a technological breakthrough in which an instrument tests a person's body signals to reveal indications of whether he or she is lying; Leonard Keeler constructed the new machine named “The Emotograph” with two of his college buddies in between classes; unfortunately this machine was destroyed in a fire at Keeler residence; but Keeler was so passioned about his job that he began to design a new instrument, this time the device was created with Western Electro Mechanical Company, and was even sold to other police departments in the country. The patent was filled on July, 30 1925 by Keeler at the United States Patent Office and was issued in January, 13 1931 with patent number 1,788,434 under the name: APARATUS FOR RECORDING ARTERIAL BLOOD.
Source: https://en.wikipedia.org/wiki/Polygraph
photo:Leonarde Keeler testing his lie-detector on a former witness for the prosecution at the trial of Bruno Hauptmann in 1937
Nicoleta CNMV Bucharest
Although not always reliable, lie detectors, or polygraph machines, have been used to uncover lies for generations; they represent a technological breakthrough in which an instrument tests a person's body signals to reveal indications of whether he or she is lying; Leonard Keeler constructed the new machine named “The Emotograph” with two of his college buddies in between classes; unfortunately this machine was destroyed in a fire at Keeler residence; but Keeler was so passioned about his job that he began to design a new instrument, this time the device was created with Western Electro Mechanical Company, and was even sold to other police departments in the country. The patent was filled on July, 30 1925 by Keeler at the United States Patent Office and was issued in January, 13 1931 with patent number 1,788,434 under the name: APARATUS FOR RECORDING ARTERIAL BLOOD.
Source: https://en.wikipedia.org/wiki/Polygraph
photo:Leonarde Keeler testing his lie-detector on a former witness for the prosecution at the trial of Bruno Hauptmann in 1937